dr. saša novak 
                     
 
 
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Scaffolds for tissue engineering
  • GANTAR, Ana, SILVA, Lucilia P. da, OLIVEIRA, Joaquim M., MARQUES, Alexandra P., CORRELO, Vitor M., NOVAK, Saša, REIS, Rui L. Nanoparticulate bioactive-glass-reinforced gellan-gum hydrogels for bone-tissue engineering. Materials science & engineering. C, Biomimetic materials, sensors and systems, 2014, 27-36,

Supported by  ARRS; COST Action Namabio

 

Photocatalytic and antibacterial anatase coatings on Ti-alloys

  • LORENZETTI, Martina, DOGŠA, Iztok, STOŠICKI, Tjaša, STOPAR, David, KALIN, Mitjan, KOBE, Spomenka, NOVAK, Saša. The influence of surface modification on bacterial adhesion to titanium-based substrates. ACS applied materials & interfaces, ISSN 1944-8244. [Print ed.], 2015, vol. 7, str. 1644-1651

  • DRNOVŠEK, Nataša, RADE, Katja, MILAČIČ, Radmila, ŠTRANCAR, Janez, NOVAK, Saša. The properties of bioactive TiO2 coatings on Ti-based implants. Surf. coat. technol.., 2012, vol. 209, 177-183


S
upported by  ARRS and FP6 (Meddelcoat, BioTiNet-M. Curie Training)

Materials for extreme conditions
SiC-continuous Fibre Reinforced Ceramic Matrix Composites for application in future fusion reactors 

The main focus is in a SiC fibre reinforced SiC composite (SiCf/SiC) for potential use for a first wall blanket in future fusion power plants. The requirements for the material are extremely tough: it has to keep its mechanical properties, chemical resistance and thermal conductivity in the temperature region up to more than 1000 °C and it should also resist high neutron fluxes. To meet these properties, a 3-dimensionally woven continuous SiC-fibres are used as a preform, which is first infiltrated with SiC-slurry to fill the large gaps and in the next step with a preceramic polymer, that after thermal treatment turns to highly crystalline SiC.  The as-produced SiCf/SiC is characterised with high through-thickness thermal conductivity in the temperature range from 25°C to 1000 °C.

  • IVEKOVIĆ, Aljaž, NOVAK, Saša, DRAŽIĆ, Goran, BLAGOEVA, Darina, GONZALEZ DE VICENTE, Sehila. Current status and prospects of SiC[sub]f/SiC for fusion structural applications. Journal of the European ceramic society, 2013, 1577-1589,

  • IVEKOVIĆ. A. DRAŽIĆ, G., NOVAK, S., Densification of a SiC-matrix by electrophoretic deposition and polymer infiltration and pyrolysis process. J. Eur. Ceram. Soc.., 2011,. 31, 5, 833-840.

  • NOVAK, S., IVEKOVIĆ, A., Fabrication of SiCf/SiC  composites by SITE-P process, J. Nucl. Mat. 2012, 427, 110-115
     

Supported by  ARRS, EFDA, FP7-Euratom

Colloidal Processing of Ceramics
Sequential slip-casting;  Dip-coating; Low Pressure Injection Moulding (LPIM); Hydrolysis Assisted Solidification (HAS);- Electrophoretic deposition (EPD)...

  • NOVAK, Saša, KOSMAČ, Tomaž, KRNEL, Kristoffer, DRAŽIĆ, Goran. Principles of the hydrolysis assisted solidification (HAS) process for forming ceramic bodies from aqueous suspension. J. Eur. Ceram. Soc.., 2002, 22, 289-295.

  • NOVAK, Saša, DAKSKOBLER, Aleš, RIBITSCH, V. The effect of water on the behaviour of alumina-paraffin suspensions for low-pressure injection moulding (LPIM). J. Eur. Ceram. Soc.., 2000, 20, 2175-2181

Supported by  ARRS


CNT-coating on SiC fibre

Electrophoretic deposition, coating, infiltration, separation
- Forming ceramic parts from colloidal suspensions
- Electrophoretic infiltration of fiber woven fabric
- Separation of species with opposite surface charge (*)

  • NOVAK, Saša, IVEKOVIĆ, Aljaž, HATTORI, Y. Production of bulk SiC parts by electrophoretic deposition from concentrated aqueous suspension. Advances in applied ceramics, ISSN 1743-6753, 2014,  14-21

  • S. NOVAK, K. KOENIG, Fabrication of alumina parts by electrophoretic deposition from ethanol and aqueous suspensions. Ceram. int., 2009, 35, 7, 2823-2829.

  • K. KOENIG,S. NOVAK, A. IVEKOVIĆ, K. RADE,D. MENG, A. R. BOCCACCINI, S. KOBE, Fabrication of CNT-SiC/SiC composites by electrophoretic deposition. J. Eur. Ceram. Soc.., 2009, 30, 1067-1210

  • NOVAK, Saša, MAVER, Uroš, PETERNEL, Špela, VENTURINI, Peter, BELE, Marjan, GABERŠČEK, Miran. Electrophoretic deposition as a tool for separation of protein inclusion bodies from host bacteria in suspension. Colloids surf., A Physicochem. eng. asp., 2009,  340, 155-160

Supported by  ARRS
(* collaboration with Institute of Chemistry)

Mesoporous SiC
  • ZORKO, Milena, NOVAK, Saša, GABERŠČEK, Miran. Fast fabrication of mesoporous SiC with high and highly ordered porosity from ordered silica templates. J. Ceram Process. Res., 2011, vol. 12, no. 6, str. 654-659

Supported by ARRS

 

 


Porous non-resorbable SiC-based ceramics for biomedical appliation
  • RADE, Katja, NOVAK, Saša, KOBE, Spomenka. The shaping and densification of silicon carbide while avoiding alumina as a sintering additive. J. mater. sci. eng., A, 2011, vol. 1, 3A, 301-311

  • RADE, Katja, NOVAK, Saša, DRAŽIĆ, Goran, KOBE, Spomenka. Co-deposition and densification of SiC with MgO for biomedical applications. J. Mater. Sci., 2012, vol. 47, no. 7, 3400-3406

 

Supported by  ARRS


 

Bioactive materials and coatings for implants
Synthesis of nanoparticulate bioactive glass powder with high resorbability
Bioactive coating on implants with porous Ti-layer

Bioactive glasses largely varies in chemical compositions. Most of state-of-art grades are prepared by melting and milling and lately also by more advanced, sol-gel technique. In both cases the powder is composed of a few microns large particles with sharp edges. In contrast, spherical nanoparticulate bioactive glass bioactvive glass particles are precipitated from sol. The can be incorporated into pores within a surface layer on metalic implant to enhance bone ingrowth.

  • DRNOVŠEK, Nataša, NOVAK, Saša, DRAGIN, Urška, ČEH, Miran, GORENŠEK, Matevž, GRADIŠAR, Marko. Bioactive glass enhances bone ingrowth into the porous titanium coating on orthopaedic implants. Int. orthop., 36, (2012) 1739-1745

  • NOVAK, Saša, DRNOVŠEK, Nataša, MURN, Gregor. Implant having a multilayer coating and process for preparing thereof : patentna prijava št. P-201000217. Ljubljana: Urad RS za intelektualno lastnino, 2010

Supported by  ARRS and Meddelcoat project (FP6 IP-SME)


Bioactive-glass for dental applications

Bioactive glasses have been well known by their bioactivity, i.e. ability to regenerate mineral part of hard tissues. Main advantage of the bioactive glass over HA is that it dissolves during application and stimulates the formation of HA in-situ, i.e. on the tooth surface and more important, within the tubules instead of forming only a discrete layer on it.

 

  • DRNOVŠEK, Nataša, PERKO Sebastjan, NOVAK, Saša, Bioactive-glass stimulates HA formation in dentine tubules (in preparation)

Supported by  ARRS


Alumina-ZTA hip-joint  with functionally graded composition
  • NOVAK, Saša, KALIN, Mitjan, LUKAS, P., ANNE, G., VLEUGELS, Jozef, VAN DER BIEST, Omer. The effect of residual stresses in functionally graded alumina-ZTA composites on their wear and friction behaviour. J. Eur. Ceram. Soc.., 2007, vol. 27, str. 151-156.

 

Supported by  ARRS and FP5 (Biograd project)

 

PEEK-based composites

Polyether-ether-ketone (PEEK) is a high-performance semi-crystalline thermoplastic material with good thermal and mechanical properties. It has been used in various engineering (and other) applications. In many of them good mechanical properties and wear resistance are of outmost importance and therefore strong trend is in reinforcement by short or long fibers, micro- or nanoparticles of various compositions. A special challenge is reinforcement by self-lubricating nanoparticles, in particular due to difficult homogenisation. 

  • CORNI, Ilaria, NEUMANN, Nico, NOVAK, Saša, KOENIG, Katja, VERONESI, Paolo, CHEN, Qi-Zhi, RYAN, Mary P., BOCCACCINI, Aldo R. Electrophoretic deposition of PEEK-nano alumina composite coatings on stainless steel. Surf. coat. technol.., 2009, 203, 1349-1359 (*)

  • NOVAK, Saša, KOENIG Katja, ZALAZNIK Maša, KALIN, Mitjan, Fabrication of PEEK-CNT composites by electrophoretic deposition, (in preparation) (**)

Supported by ARRS
(*) Collaboration with Imperial College London
(**) Collaboration with CTD, University of Ljubljana)

Safety assessment of nanomaterials

- Cytotoxicity and genotoxicity of (TiO2) nanoparticles (*)
- Nanomaterials in contact with food (**)
-
Control of technological nanoparticles in the working environment (***)

  • SKOČAJ, Matej, FILIPIČ, Metka, PETKOVIĆ, Jana, NOVAK, Saša. Titanium dioxide in our everyday life: is it safe?. Radiol. oncol., 2011, vol. 45, no. 4, str. 227-247

  • PETKOVIĆ, Jana, KÜZMA, Tadeja, RADE, Katja, NOVAK, Saša, FILIPIČ, Metka. Pre-irradiation of anatase TiO2 particles with UV enhances their cytotoxic and genotoxic potential in human hepatoma HepG2 cells. J. hazard. mater.., 2011, 196, 145-152.

  • PETKOVIĆ, Jana, ŽEGURA, Bojana, STEFANOVIĆ, Magdalena, DRNOVŠEK, Nataša, USKOKOVIĆ, Dragan, NOVAK, Saša, FILIPIČ, Metka. DNA damage and alterations in expression of DNA damage responsive genes induced by TiO2 nanoparticles in human hepatoma HepG2 cells. Nanotoxicology, 2011, 5, 341-353

Supported by ARRS
(*) Collaboration with National Institute for Biology
(**) Collaboration with IVZ RS
(**) Collaboration with Depts. F2 and F5

Tribochemistry:
Chemically Assisted Wear and Machining of Ceramics

  • NOVAK, Saša, DRAŽIĆ, Goran, KALIN, Mitjan. Structural changes in ZrO2 ceramics during sliding under various environments. Wear., 2005, 259, 562-568

  • KALIN, Mitjan, NOVAK, Saša, VIŽINTIN, Jože. Surface charge as a new concept for boundary lubrication of ceramics with water. J. phys., D, Appl. phys., 2006, 39, 3138-3149.

  • KALIN, Mitjan, DRAŽIĆ, Goran, NOVAK, Saša, VIŽINTIN, Jože. Wear mechanisms associated with the lubrication of zirconia ceramics in various aqueous solutions. J. Eur. Ceram. Soc.., 2006, 26, 223-232

 

Supported by ARRS
(*) Collaboration with CTD, University of Ljubljana)